Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi! Sorry to hear you’re running into this issue. To narrow it down, could you confirm whether the email address is an Outlook.com/Hotmail account or a third-party (custom domain/provider) account? Please also check if new emails arrive normally in the web version at Outlook.com. If emails work on the web but not in the app, the next step is to remove/disconnect the account from the app and add it back to re-sync and rebuild the connection.